This project seeks to improve the health of patients with chronic kidney disease (CKD) by developing and testing an electronic health intervention (that will combine secure e--mail, smartphone text message, and online video materials) to promote patient use of effective medications. The information we collect on the electronic health intervention will guide future research, including a larger trial and other studies among related patient groups (e.g., racial minorities) and diseases (e.g., type 2 diabetes mellitus). The project has the potential to improve health outcomes for the millions of patients with CKD who are not yet receiving effective medications.